* [http://www.joomla.org/ Joomla] A free open source [[Content Management Systems (CMS)|content management system]] for publishing content on the World Wide Web and intranets. Joomla is licensed under the GPL.

* [http://www.joomla.org/ Joomla] A free open source [[Content Management Systems (CMS)|content management system]] for publishing content on the World Wide Web and intranets. Joomla is licensed under the GPL.

* [http://kete.net.nz/ Kete] - Open source digital library solution.

* [http://kete.net.nz/ Kete] - Open source digital library solution.

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* [http://www.koha.org Koha] Open Source ILS -- Full-featured Library Automation System, including OPAC, Circulation/Borrower Management, Budget-based Acquisitions, Serials Management, and Reporting/Administrative modules. MARC21 and UNIMARC are supported. Advanced search capabilities, integrated Z39.50 server and client, and self-checkout. Commercial Installation and Support available worldwide from : [http://liblime.com/koha LibLime]. Hundreds of libraries of all sizes and types are using Koha worldwide. The system can support very large collection sizes (tens of millions of records) and is very easy to customize as it's written in Perl, MySQL and uses the Zebra indexing engine for searching.

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* [http://koha-community.org Koha] Open Source ILS -- Full-featured Library Automation System, including OPAC, Circulation/Borrower Management, Budget-based Acquisitions, Serials Management, and Reporting/Administrative modules. MARC21 and UNIMARC are supported. Advanced search capabilities, integrated Z39.50 server and client, and self-checkout. Commercial Installation and Support available worldwide from : [http://liblime.com/koha LibLime]. Hundreds of libraries of all sizes and types are using Koha worldwide. The system can support very large collection sizes (tens of millions of records) and is very easy to customize as it's written in Perl, MySQL and uses the Zebra indexing engine for searching.

Drupal -- Free (GPL) [[Content Management Systems (CMS)|Content Management System] framework with lots of features out of the box and tons of third party modules. Ideal to build a library website, some modules allowing to provide an OPAC 2.0 front-end for your ILS. PHP MySQL based.

Evergreen Open Source ILS originally created by the Georgia Public Library Service.

Google Docs & Spreadsheets A web browser-based word processor & spreadsheet application based on the Writely beta product that Google acquired in 2006. With this application, you can publish a document or spreadsheet online. It also allows you to collaborate with anyone who has access to a web browser. You can invite other people to read or edit your document by entering their e-mail addresses on a form.

Groovix PAC open source Public Access Computing software with SIP2 authentication, time management, reservations; a complete solution for library public computers

Instant Instruction Feedback Forms Instant Instruction Feedback Forms are web-based surveys that are designed to offer librarians a simple way to evaluate their information literacy/bibliographic instruction sessions. These forms are open source software and are available for free download under the GNU General Public License.

Koha Open Source ILS -- Full-featured Library Automation System, including OPAC, Circulation/Borrower Management, Budget-based Acquisitions, Serials Management, and Reporting/Administrative modules. MARC21 and UNIMARC are supported. Advanced search capabilities, integrated Z39.50 server and client, and self-checkout. Commercial Installation and Support available worldwide from : LibLime. Hundreds of libraries of all sizes and types are using Koha worldwide. The system can support very large collection sizes (tens of millions of records) and is very easy to customize as it's written in Perl, MySQL and uses the Zebra indexing engine for searching.

Kompozer web authoring tool, similar in function to Adobe Dreamweaver.

Prospero An Open Source Internet Document Delivery (IDD) System (The Ohio State University). [NOTE: Development ceased in 2004, although the last release is still available for download and modification.]

The Reference Portal The Reference Portal is a departmental intranet that is designed to consolidate web resources, services, and assessment tools for reference librarians. It uses DHTML layers to give librarians instant access to frequently used web resources and allows librarians to record information about reference interactions, workshops, and instruction sessions for evaluation.

Scriblio (formerly WPopac) is an award winning, free, open source CMS and OPAC with faceted searching and browsing features based on WordPress.

Sphinx A free full-text search engine, distributed under GPL version 2. A standalone search engine, meant to provide fast, size-efficient and relevant full-text search functions to other applications. Sphinx was specially designed to integrate well with SQL databases and scripting languages. Currently built-in data sources support fetching data either via direct connection to MySQL or PostgreSQL, or using XML pipe mechanism (a pipe to indexer in special XML-based format which Sphinx recognizes).

Squid Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages.

SquidGuard is a combined filter, redirector and access controller plugin for Squid.

SubjectsPlus is a free and open source tool to help you manage several interrelated parts of your library website: Subject or Course Guides; A-Z List of Databases; FAQs; Suggestion Box (aka TalkBack); Staff List.

Turn 1 PC into 10 -- open source Groovix SLIM multi-user software from Open Sense Solutions which enables you to run multiple screens, keyboards, and users from a single PC.